Metal shears



septs, 1929. R, HEINRICH T 1,727,059

METAL SHEARS Fi'ied Aug. e, 192'? Patented Sept: 3, `1929.

unirsi) i STAT-Es ROBERT Hmmm, OF-RACINB. WISCQNSlN- METAL sHnAns.

Application Viiled. August 6, :1927, Seria1'No.211,172.l

This invention relates to metal shearsy and shape cutters. Y v 1 rlhisinvention is an improvement over that disclosed in an application formetal shears, filed May 16, 1927, Serial No. 191,711', in

which I am a jointapplicant, and has in general the same objects asthose set forthin such application. f

In sheet metal work it is frequentlyY desirable to form cuts terminatingin rounded ends. rThis work has heretofore been done by drilling theholes in the sheet metal to form the rounded ends,y and thereaftermaking straightcuts to the drilled holes. g

The object of my invention is to provide a new, scientifically designedcutter that isr for use in pattern shops and tool rooms whenmanufacturing templates and gauges. It cuts sheet metal into any designas easily as l a paper shears cuts paper. It cuts template- `makingcosts to a full tenth of former slowv inetiicient methods. j

Furthermore, this metal shears and shape cutter is so accuratelydesigned that it can 1' cut sheet metal into any pattern withoutnecessitating much filing.v A few quick, short downstrokes do the work.kThe concave cutting knife shears along any curved line. Thesemi-circular punch cuts out the hard-to get-at corners. V 4

An embodiment of the invent-ion is shown in the accompanying drawings,in which:

Figure 1 is a sideelevation partly broken away of the device; f

Figure 2 is afsectional' view on the line 2-2 ofFigurel; j, `l ,Y

Figure 3 is a sectional View on the line 3 3 of Figure 1;

Figure 4 is a plan view of the upper blade; Figure .5 is a view showinga piece of sheet metal cut by means of the shears Aand illustrating thetype of work performed by the shears. Referring to the drawings, it willbe seen that the device comprises a main body portion 1 which isprovided with a Vmovable blade 2 pivotally mounted, as indicated at 3,and provided with an operating yhandle 4. This movable blade, as may beseen from Figure 4, is provided with a rounded outer end 5 for a purposehereinafter to appear. e Pref-` erably, the lower surface of the bladeis curved, as shown in Figure 1, so as to get a gradual shearing actionfrom the inner portion of the shears outwardly as the movable blade isforced downwardly.

The body pore@ 1 is provided with an offset lower portion towhich thebladef is j secured bymeans of a pair of screws 7. The

blade 6 is provided with an inwardly turned.

lip 8 (see Figure') which cooperates with the rounded end 5 ofthemovable blade 2.` The blade 6 is bevelled throughout itslengthincluding the rounded or inwardly curved lip '8, as may be seen fromFigures 1 and 2. Further, it is to be noted .that the lopposite edge ofthe movable blade is also bevelled inthe reverse direction, as may beseen from Figure 2. It is to benoted also from Figure 1, Athat the bladeis provided with a cutout 9 extending from the lower edge, asy shown in1 Figure l, upwardly to approximate its cener. A

Weheny it is desired to make merely a l straight Acut without theiinishof curved ends,

the blade may be reversedto present thev straight edge without theinwardly curved lip. This straight edge cooperates with the blade 2 inthe usual manner.

Itis preferable to provide the metal shears with supporting meanswhereby it may be either securelyk gripped in the vise, as described inour copendingy application, or may be secured to the bench or floor. Forinstance, a pair of angle iron feet 10 may be secured to thebody portion1, as shown in Figures 1 and 2. These angle iron feet extendcontinuouslyonone side from one end ofthe device to the other andon theother side stop short at the linesL indicated by the reference char-`acter l1 in Figure 1. This provides an open space on one side of thedevice. The body portion 1 is provided' with a'cutout correl sponding tothe lines 11 and with sockets 12 which receive the trunnions 13 of. awedge shaped pivoted lip 14. Thisvpivoted lip,as

maybe seen from Figures 1 and 2, is prefer-.

ably made of twofhlalf sections riveted together witha spacing block 15between them. v

It is adapted to be gripped between the vise jaws 16 (see Figure 2) andthe upward tav pering construction will prevent withdrawal may be usedas the ordinary type of metal shears for cutting straight slots, ifdesired, or by a suitable adjustment, that is to say, reversal of thestationary blade may be used for cutting slots terminating in roundedends. Y

It will be seen further that the device is very simple in constructionand is eminently practical.

TWhile I have mentioned in a general Way certain shapes Which the bladesare capable of cutting, it should be distinctly understood that due tothis peculiar blade combination I am enabled to cut any desired shape,such as square, hexagon, polygonal, U-shape, halfround, yogee curves, orthe like, all of Which configurations can be cut in various sizes.

Although the invention has been described in considerable detail, suchdescriptlon is intended as illustrative rather than limiting as theinvention maybe variously embodied and as the scope of such invention isto be determined as claimed.

I claim:

1. A pair of metal shears comprising a rigid body portion7 a normallystationary plural-edged blade, having a cut-out in one end thereofeXtending from one edge of the blade to approximately the longitudinaleenter thereof, means f-or securing said blade to the body portion witheither cutting edge uppermost, a movable blade secured to said bodyportion and cooperating with the rst Amentioned blade, said movableblade having a rounded end, an inwardly curved end on the firstmentioned blade yon one of its cutting edges at one side of the cut-outand having its other cutting edge continuous and straight.

2. A pair of metal shears comprising a rigid body portion, a movableblade pivotally secured thereto and provided With a curved end, meansfor opening said movable blade, a normally stationary blade havingcutting edges on opposite sides thereof and formed With a cut-outportion in one end extending` from one cutting edge to approximately thelongitudinal center thereof, one of said cutting edges on the stationaryblade having an. inwardly turned lip at one side of the cut-out tocooperate with the curved end of the movable blade, and securing meanspassing through the body portion and engaging said last mentioned bladeapproximately along its central line.

In testimony that I claim the foregoing I have hereunto set my hand atRacine, in the county of Racine and State of Wisconsin.

ROBERT HEINRICH..

